/*
    libmad - MPEG audio decoder library
    Copyright (C) 2000-2004 Underbit Technologies, Inc.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    If you would like to negotiate alternate licensing terms, you may do
    so by contacting: Underbit Technologies, Inc. <info@underbit.com>
*/

# ifdef __cplusplus
extern "C" {
# endif


# define SIZEOF_INT 4
# define SIZEOF_LONG 4
# define SIZEOF_LONG_LONG 8


/* Id: version.h,v 1.26 2004/01/23 09:41:33 rob Exp */

# ifndef LIBMAD_VERSION_H
# define LIBMAD_VERSION_H

# define MAD_VERSION_MAJOR	0
# define MAD_VERSION_MINOR	15
# define MAD_VERSION_PATCH	1
# define MAD_VERSION_EXTRA	" (beta)"

# define MAD_VERSION_STRINGIZE(str)	#str
# define MAD_VERSION_STRING(num)	MAD_VERSION_STRINGIZE(num)

# define MAD_VERSION		MAD_VERSION_STRING(MAD_VERSION_MAJOR) "."  \
				MAD_VERSION_STRING(MAD_VERSION_MINOR) "."  \
				MAD_VERSION_STRING(MAD_VERSION_PATCH)  \
				MAD_VERSION_EXTRA

# define MAD_PUBLISHYEAR	"2000-2004"
# define MAD_AUTHOR		"Underbit Technologies, Inc."
# define MAD_EMAIL		"info@underbit.com"

extern char const mad_version[];
extern char const mad_copyright[];
extern char const mad_author[];
extern char const mad_build[];

# endif

/* Id: fixed.h,v 1.38 2004/02/17 02:02:03 rob Exp */

# ifndef LIBMAD_FIXED_H
# define LIBMAD_FIXED_H

# if SIZEOF_INT >= 4
typedef   signed int mad_fixed_t;

typedef   signed int mad_fixed64hi_t;
typedef unsigned int mad_fixed64lo_t;
# else
typedef   signed long mad_fixed_t;

typedef   signed long mad_fixed64hi_t;
typedef unsigned long mad_fixed64lo_t;
# endif

# if defined(_MSC_VER)
#  define mad_fixed64_t  signed __int64
# elif 1 || defined(__GNUC__)
#  define mad_fixed64_t  signed long long
# endif

# if defined(FPM_FLOAT)
typedef double mad_sample_t;
# else
typedef mad_fixed_t mad_sample_t;
# endif

/*
    Fixed-point format: 0xABBBBBBB
    A == whole part      (sign + 3 bits)
    B == fractional part (28 bits)

    Values are signed two's complement, so the effective range is:
    0x80000000 to 0x7fffffff
         -8.0 to +7.9999999962747097015380859375

    The smallest representable value is:
    0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)

    28 bits of fractional accuracy represent about
    8.6 digits of decimal accuracy.

    Fixed-point numbers can be added or subtracted as normal
    integers, but multiplication requires shifting the 64-bit result
    from 56 fractional bits back to 28 (and rounding.)

    Changing the definition of MAD_F_FRACBITS is only partially
    supported, and must be done with care.
*/

# define MAD_F_FRACBITS		28

# if MAD_F_FRACBITS == 28
#  define MAD_F(x)		((mad_fixed_t) (x##L))
# else
#  if MAD_F_FRACBITS < 28
#   warning "MAD_F_FRACBITS < 28"
#   define MAD_F(x)		((mad_fixed_t)  \
				 (((x##L) +  \
				   (1L << (28 - MAD_F_FRACBITS - 1))) >>  \
				  (28 - MAD_F_FRACBITS)))
#  elif MAD_F_FRACBITS > 28
#   error "MAD_F_FRACBITS > 28 not currently supported"
#   define MAD_F(x)		((mad_fixed_t)  \
				 ((x##L) << (MAD_F_FRACBITS - 28)))
#  endif
# endif

# define MAD_F_MIN		((mad_fixed_t) -0x80000000L)
# define MAD_F_MAX		((mad_fixed_t) +0x7fffffffL)

# define MAD_F_ONE		MAD_F(0x10000000)

# define mad_f_tofixed(x)	((mad_fixed_t)  \
				 ((x) * (double) (1L << MAD_F_FRACBITS) + 0.5))
# define mad_f_todouble(x)	((double)  \
				 ((x) / (double) (1L << MAD_F_FRACBITS)))

# define mad_f_intpart(x)	((x) >> MAD_F_FRACBITS)
# define mad_f_fracpart(x)	((x) & ((1L << MAD_F_FRACBITS) - 1))
/* (x should be positive) */

# define mad_f_fromint(x)	((x) << MAD_F_FRACBITS)

# define mad_f_add(x, y)	((x) + (y))
# define mad_f_sub(x, y)	((x) - (y))

# if defined(FPM_FLOAT)
#  error "FPM_FLOAT not yet supported"

#  undef MAD_F
#  define MAD_F(x)		mad_f_todouble(x)

#  define mad_f_mul(x, y)	((x) * (y))
#  define mad_f_scale64

#  undef ASO_ZEROCHECK

# elif defined(FPM_64BIT)

/*
    This version should be the most accurate if 64-bit types are supported by
    the compiler, although it may not be the most efficient.
*/
#  if defined(OPT_ACCURACY)
#   define mad_f_mul(x, y)  \
    ((mad_fixed_t)  \
     ((((mad_fixed64_t) (x) * (y)) +  \
       (1L << (MAD_F_SCALEBITS - 1))) >> MAD_F_SCALEBITS))
#  else
#   define mad_f_mul(x, y)  \
    ((mad_fixed_t) (((mad_fixed64_t) (x) * (y)) >> MAD_F_SCALEBITS))
#  endif

#  define MAD_F_SCALEBITS  MAD_F_FRACBITS

/* --- Intel --------------------------------------------------------------- */

# elif defined(FPM_INTEL)

#  if defined(_MSC_VER)
#   pragma warning(push)
#   pragma warning(disable: 4035)  /* no return value */
static __forceinline
mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y) {
    enum {
        fracbits = MAD_F_FRACBITS
    };

    __asm {
        mov eax, x
        imul y
        shrd eax, edx, fracbits
    }

    /* implicit return of eax */
}
#   pragma warning(pop)

#   define mad_f_mul		mad_f_mul_inline
#   define mad_f_scale64
#  else
/*
    This Intel version is fast and accurate; the disposition of the least
    significant bit depends on OPT_ACCURACY via mad_f_scale64().
*/
#   define MAD_F_MLX(hi, lo, x, y)  \
    asm ("imull %3"  \
	 : "=a" (lo), "=d" (hi)  \
	 : "%a" (x), "rm" (y)  \
	 : "cc")

#   if defined(OPT_ACCURACY)
/*
    This gives best accuracy but is not very fast.
*/
#    define MAD_F_MLA(hi, lo, x, y)  \
    ({ mad_fixed64hi_t __hi;  \
       mad_fixed64lo_t __lo;  \
       MAD_F_MLX(__hi, __lo, (x), (y));  \
       asm ("addl %2,%0\n\t"  \
	    "adcl %3,%1"  \
	    : "=rm" (lo), "=rm" (hi)  \
	    : "r" (__lo), "r" (__hi), "0" (lo), "1" (hi)  \
	    : "cc");  \
    })
#   endif  /* OPT_ACCURACY */

#   if defined(OPT_ACCURACY)
/*
    Surprisingly, this is faster than SHRD followed by ADC.
*/
#    define mad_f_scale64(hi, lo)  \
    ({ mad_fixed64hi_t __hi_;  \
       mad_fixed64lo_t __lo_;  \
       mad_fixed_t __result;  \
       asm ("addl %4,%2\n\t"  \
	    "adcl %5,%3"  \
	    : "=rm" (__lo_), "=rm" (__hi_)  \
	    : "0" (lo), "1" (hi),  \
	      "ir" (1L << (MAD_F_SCALEBITS - 1)), "ir" (0)  \
	    : "cc");  \
       asm ("shrdl %3,%2,%1"  \
	    : "=rm" (__result)  \
	    : "0" (__lo_), "r" (__hi_), "I" (MAD_F_SCALEBITS)  \
	    : "cc");  \
       __result;  \
    })
#   elif defined(OPT_INTEL)
/*
    Alternate Intel scaling that may or may not perform better.
*/
#    define mad_f_scale64(hi, lo)  \
    ({ mad_fixed_t __result;  \
       asm ("shrl %3,%1\n\t"  \
	    "shll %4,%2\n\t"  \
	    "orl %2,%1"  \
	    : "=rm" (__result)  \
	    : "0" (lo), "r" (hi),  \
	      "I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS)  \
	    : "cc");  \
       __result;  \
    })
#   else
#    define mad_f_scale64(hi, lo)  \
    ({ mad_fixed_t __result;  \
       asm ("shrdl %3,%2,%1"  \
	    : "=rm" (__result)  \
	    : "0" (lo), "r" (hi), "I" (MAD_F_SCALEBITS)  \
	    : "cc");  \
       __result;  \
    })
#   endif  /* OPT_ACCURACY */

#   define MAD_F_SCALEBITS  MAD_F_FRACBITS
#  endif

/* --- ARM ----------------------------------------------------------------- */

# elif defined(FPM_ARM)

/*
    This ARM V4 version is as accurate as FPM_64BIT but much faster. The
    least significant bit is properly rounded at no CPU cycle cost!
*/
# if 1
/*
    This is faster than the default implementation via MAD_F_MLX() and
    mad_f_scale64().
*/
#  define mad_f_mul(x, y)  \
    ({ mad_fixed64hi_t __hi;  \
       mad_fixed64lo_t __lo;  \
       mad_fixed_t __result;  \
       asm ("smull	%0, %1, %3, %4\n\t"  \
	    "movs	%0, %0, lsr %5\n\t"  \
	    "adc	%2, %0, %1, lsl %6"  \
	    : "=&r" (__lo), "=&r" (__hi), "=r" (__result)  \
	    : "%r" (x), "r" (y),  \
	      "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS)  \
	    : "cc");  \
       __result;  \
    })
# endif

#  define MAD_F_MLX(hi, lo, x, y)  \
    asm ("smull	%0, %1, %2, %3"  \
	 : "=&r" (lo), "=&r" (hi)  \
	 : "%r" (x), "r" (y))

#  define MAD_F_MLA(hi, lo, x, y)  \
    asm ("smlal	%0, %1, %2, %3"  \
	 : "+r" (lo), "+r" (hi)  \
	 : "%r" (x), "r" (y))

#  define MAD_F_MLN(hi, lo)  \
    asm ("rsbs	%0, %2, #0\n\t"  \
	 "rsc	%1, %3, #0"  \
	 : "=r" (lo), "=r" (hi)  \
	 : "0" (lo), "1" (hi)  \
	 : "cc")

#  define mad_f_scale64(hi, lo)  \
    ({ mad_fixed_t __result;  \
       asm ("movs	%0, %1, lsr %3\n\t"  \
	    "adc	%0, %0, %2, lsl %4"  \
	    : "=&r" (__result)  \
	    : "r" (lo), "r" (hi),  \
	      "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS)  \
	    : "cc");  \
       __result;  \
    })

#  define MAD_F_SCALEBITS  MAD_F_FRACBITS

/* --- MIPS ---------------------------------------------------------------- */

# elif defined(FPM_MIPS)

/*
    This MIPS version is fast and accurate; the disposition of the least
    significant bit depends on OPT_ACCURACY via mad_f_scale64().
*/
#  define MAD_F_MLX(hi, lo, x, y)  \
    asm ("mult	%2,%3"  \
	 : "=l" (lo), "=h" (hi)  \
	 : "%r" (x), "r" (y))

# if defined(HAVE_MADD_ASM)
#  define MAD_F_MLA(hi, lo, x, y)  \
    asm ("madd	%2,%3"  \
	 : "+l" (lo), "+h" (hi)  \
	 : "%r" (x), "r" (y))
# elif defined(HAVE_MADD16_ASM)
/*
    This loses significant accuracy due to the 16-bit integer limit in the
    multiply/accumulate instruction.
*/
#  define MAD_F_ML0(hi, lo, x, y)  \
    asm ("mult	%2,%3"  \
	 : "=l" (lo), "=h" (hi)  \
	 : "%r" ((x) >> 12), "r" ((y) >> 16))
#  define MAD_F_MLA(hi, lo, x, y)  \
    asm ("madd16	%2,%3"  \
	 : "+l" (lo), "+h" (hi)  \
	 : "%r" ((x) >> 12), "r" ((y) >> 16))
#  define MAD_F_MLZ(hi, lo)  ((mad_fixed_t) (lo))
# endif

# if defined(OPT_SPEED)
#  define mad_f_scale64(hi, lo)  \
    ((mad_fixed_t) ((hi) << (32 - MAD_F_SCALEBITS)))
#  define MAD_F_SCALEBITS  MAD_F_FRACBITS
# endif

/* --- SPARC --------------------------------------------------------------- */

# elif defined(FPM_SPARC)

/*
    This SPARC V8 version is fast and accurate; the disposition of the least
    significant bit depends on OPT_ACCURACY via mad_f_scale64().
*/
#  define MAD_F_MLX(hi, lo, x, y)  \
    asm ("smul %2, %3, %0\n\t"  \
	 "rd %%y, %1"  \
	 : "=r" (lo), "=r" (hi)  \
	 : "%r" (x), "rI" (y))

/* --- PowerPC ------------------------------------------------------------- */

# elif defined(FPM_PPC)

/*
    This PowerPC version is fast and accurate; the disposition of the least
    significant bit depends on OPT_ACCURACY via mad_f_scale64().
*/
#  define MAD_F_MLX(hi, lo, x, y)  \
    do {  \
      asm ("mullw %0,%1,%2"  \
	   : "=r" (lo)  \
	   : "%r" (x), "r" (y));  \
      asm ("mulhw %0,%1,%2"  \
	   : "=r" (hi)  \
	   : "%r" (x), "r" (y));  \
    }  \
    while (0)

#  if defined(OPT_ACCURACY)
/*
    This gives best accuracy but is not very fast.
*/
#   define MAD_F_MLA(hi, lo, x, y)  \
    ({ mad_fixed64hi_t __hi;  \
       mad_fixed64lo_t __lo;  \
       MAD_F_MLX(__hi, __lo, (x), (y));  \
       asm ("addc %0,%2,%3\n\t"  \
	    "adde %1,%4,%5"  \
	    : "=r" (lo), "=r" (hi)  \
	    : "%r" (lo), "r" (__lo),  \
	      "%r" (hi), "r" (__hi)  \
	    : "xer");  \
    })
#  endif

#  if defined(OPT_ACCURACY)
/*
    This is slower than the truncating version below it.
*/
#   define mad_f_scale64(hi, lo)  \
    ({ mad_fixed_t __result, __round;  \
       asm ("rotrwi %0,%1,%2"  \
	    : "=r" (__result)  \
	    : "r" (lo), "i" (MAD_F_SCALEBITS));  \
       asm ("extrwi %0,%1,1,0"  \
	    : "=r" (__round)  \
	    : "r" (__result));  \
       asm ("insrwi %0,%1,%2,0"  \
	    : "+r" (__result)  \
	    : "r" (hi), "i" (MAD_F_SCALEBITS));  \
       asm ("add %0,%1,%2"  \
	    : "=r" (__result)  \
	    : "%r" (__result), "r" (__round));  \
       __result;  \
    })
#  else
#   define mad_f_scale64(hi, lo)  \
    ({ mad_fixed_t __result;  \
       asm ("rotrwi %0,%1,%2"  \
	    : "=r" (__result)  \
	    : "r" (lo), "i" (MAD_F_SCALEBITS));  \
       asm ("insrwi %0,%1,%2,0"  \
	    : "+r" (__result)  \
	    : "r" (hi), "i" (MAD_F_SCALEBITS));  \
       __result;  \
    })
#  endif

#  define MAD_F_SCALEBITS  MAD_F_FRACBITS

/* --- Default ------------------------------------------------------------- */

# elif defined(FPM_DEFAULT)

/*
    This version is the most portable but it loses significant accuracy.
    Furthermore, accuracy is biased against the second argument, so care
    should be taken when ordering operands.

    The scale factors are constant as this is not used with SSO.

    Pre-rounding is required to stay within the limits of compliance.
*/
#  if defined(OPT_SPEED)
#   define mad_f_mul(x, y)	(((x) >> 12) * ((y) >> 16))
#  else
#   define mad_f_mul(x, y)	((((x) + (1L << 11)) >> 12) *  \
				 (((y) + (1L << 15)) >> 16))
#  endif

/* ------------------------------------------------------------------------- */

# else
#  error "no FPM selected"
# endif

/* default implementations */

# if !defined(mad_f_mul)
#  define mad_f_mul(x, y)  \
    ({ register mad_fixed64hi_t __hi;  \
       register mad_fixed64lo_t __lo;  \
       MAD_F_MLX(__hi, __lo, (x), (y));  \
       mad_f_scale64(__hi, __lo);  \
    })
# endif

# if !defined(MAD_F_MLA)
#  define MAD_F_ML0(hi, lo, x, y)	((lo)  = mad_f_mul((x), (y)))
#  define MAD_F_MLA(hi, lo, x, y)	((lo) += mad_f_mul((x), (y)))
#  define MAD_F_MLN(hi, lo)		((lo)  = -(lo))
#  define MAD_F_MLZ(hi, lo)		((void) (hi), (mad_fixed_t) (lo))
# endif

# if !defined(MAD_F_ML0)
#  define MAD_F_ML0(hi, lo, x, y)	MAD_F_MLX((hi), (lo), (x), (y))
# endif

# if !defined(MAD_F_MLN)
#  define MAD_F_MLN(hi, lo)		((hi) = ((lo) = -(lo)) ? ~(hi) : -(hi))
# endif

# if !defined(MAD_F_MLZ)
#  define MAD_F_MLZ(hi, lo)		mad_f_scale64((hi), (lo))
# endif

# if !defined(mad_f_scale64)
#  if defined(OPT_ACCURACY)
#   define mad_f_scale64(hi, lo)  \
    ((((mad_fixed_t)  \
       (((hi) << (32 - (MAD_F_SCALEBITS - 1))) |  \
	((lo) >> (MAD_F_SCALEBITS - 1)))) + 1) >> 1)
#  else
#   define mad_f_scale64(hi, lo)  \
    ((mad_fixed_t)  \
     (((hi) << (32 - MAD_F_SCALEBITS)) |  \
      ((lo) >> MAD_F_SCALEBITS)))
#  endif
#  define MAD_F_SCALEBITS  MAD_F_FRACBITS
# endif

/* C routines */

mad_fixed_t mad_f_abs(mad_fixed_t);
mad_fixed_t mad_f_div(mad_fixed_t, mad_fixed_t);

# endif

/* Id: bit.h,v 1.12 2004/01/23 09:41:32 rob Exp */

# ifndef LIBMAD_BIT_H
# define LIBMAD_BIT_H

struct mad_bitptr {
    unsigned char const *byte;
    unsigned short cache;
    unsigned short left;
};

void mad_bit_init(struct mad_bitptr *, unsigned char const *);

# define mad_bit_finish(bitptr)		/* nothing */

unsigned int mad_bit_length(struct mad_bitptr const *,
                            struct mad_bitptr const *);

# define mad_bit_bitsleft(bitptr)  ((bitptr)->left)
unsigned char const *mad_bit_nextbyte(struct mad_bitptr const *);

void mad_bit_skip(struct mad_bitptr *, unsigned int);
unsigned long mad_bit_read(struct mad_bitptr *, unsigned int);
void mad_bit_write(struct mad_bitptr *, unsigned int, unsigned long);

unsigned short mad_bit_crc(struct mad_bitptr, unsigned int, unsigned short);

# endif

/* Id: timer.h,v 1.16 2004/01/23 09:41:33 rob Exp */

# ifndef LIBMAD_TIMER_H
# define LIBMAD_TIMER_H

typedef struct {
    signed long seconds;		/* whole seconds */
    unsigned long fraction;	/* 1/MAD_TIMER_RESOLUTION seconds */
} mad_timer_t;

extern mad_timer_t const mad_timer_zero;

# define MAD_TIMER_RESOLUTION	352800000UL

enum mad_units {
    MAD_UNITS_HOURS	 =    -2,
    MAD_UNITS_MINUTES	 =    -1,
    MAD_UNITS_SECONDS	 =     0,

    /* metric units */

    MAD_UNITS_DECISECONDS	 =    10,
    MAD_UNITS_CENTISECONDS =   100,
    MAD_UNITS_MILLISECONDS =  1000,

    /* audio sample units */

    MAD_UNITS_8000_HZ	 =  8000,
    MAD_UNITS_11025_HZ	 = 11025,
    MAD_UNITS_12000_HZ	 = 12000,

    MAD_UNITS_16000_HZ	 = 16000,
    MAD_UNITS_22050_HZ	 = 22050,
    MAD_UNITS_24000_HZ	 = 24000,

    MAD_UNITS_32000_HZ	 = 32000,
    MAD_UNITS_44100_HZ	 = 44100,
    MAD_UNITS_48000_HZ	 = 48000,

    /* video frame/field units */

    MAD_UNITS_24_FPS	 =    24,
    MAD_UNITS_25_FPS	 =    25,
    MAD_UNITS_30_FPS	 =    30,
    MAD_UNITS_48_FPS	 =    48,
    MAD_UNITS_50_FPS	 =    50,
    MAD_UNITS_60_FPS	 =    60,

    /* CD audio frames */

    MAD_UNITS_75_FPS	 =    75,

    /* video drop-frame units */

    MAD_UNITS_23_976_FPS	 =   -24,
    MAD_UNITS_24_975_FPS	 =   -25,
    MAD_UNITS_29_97_FPS	 =   -30,
    MAD_UNITS_47_952_FPS	 =   -48,
    MAD_UNITS_49_95_FPS	 =   -50,
    MAD_UNITS_59_94_FPS	 =   -60
};

# define mad_timer_reset(timer)	((void) (*(timer) = mad_timer_zero))

int mad_timer_compare(mad_timer_t, mad_timer_t);

# define mad_timer_sign(timer)	mad_timer_compare((timer), mad_timer_zero)

void mad_timer_negate(mad_timer_t *);
mad_timer_t mad_timer_abs(mad_timer_t);

void mad_timer_set(mad_timer_t *, unsigned long, unsigned long, unsigned long);
void mad_timer_add(mad_timer_t *, mad_timer_t);
void mad_timer_multiply(mad_timer_t *, signed long);

signed long mad_timer_count(mad_timer_t, enum mad_units);
unsigned long mad_timer_fraction(mad_timer_t, unsigned long);
void mad_timer_string(mad_timer_t, char *, char const *,
                      enum mad_units, enum mad_units, unsigned long);

# endif

/* Id: stream.h,v 1.20 2004/02/05 09:02:39 rob Exp */

# ifndef LIBMAD_STREAM_H
# define LIBMAD_STREAM_H


# define MAD_BUFFER_GUARD	8
# define MAD_BUFFER_MDLEN	(511 + 2048 + MAD_BUFFER_GUARD)

enum mad_error {
    MAD_ERROR_NONE	   = 0x0000,	/* no error */

    MAD_ERROR_BUFLEN	   = 0x0001,	/* input buffer too small (or EOF) */
    MAD_ERROR_BUFPTR	   = 0x0002,	/* invalid (null) buffer pointer */

    MAD_ERROR_NOMEM	   = 0x0031,	/* not enough memory */

    MAD_ERROR_LOSTSYNC	   = 0x0101,	/* lost synchronization */
    MAD_ERROR_BADLAYER	   = 0x0102,	/* reserved header layer value */
    MAD_ERROR_BADBITRATE	   = 0x0103,	/* forbidden bitrate value */
    MAD_ERROR_BADSAMPLERATE  = 0x0104,	/* reserved sample frequency value */
    MAD_ERROR_BADEMPHASIS	   = 0x0105,	/* reserved emphasis value */

    MAD_ERROR_BADCRC	   = 0x0201,	/* CRC check failed */
    MAD_ERROR_BADBITALLOC	   = 0x0211,	/* forbidden bit allocation value */
    MAD_ERROR_BADSCALEFACTOR = 0x0221,	/* bad scalefactor index */
    MAD_ERROR_BADMODE        = 0x0222,	/* bad bitrate/mode combination */
    MAD_ERROR_BADFRAMELEN	   = 0x0231,	/* bad frame length */
    MAD_ERROR_BADBIGVALUES   = 0x0232,	/* bad big_values count */
    MAD_ERROR_BADBLOCKTYPE   = 0x0233,	/* reserved block_type */
    MAD_ERROR_BADSCFSI	   = 0x0234,	/* bad scalefactor selection info */
    MAD_ERROR_BADDATAPTR	   = 0x0235,	/* bad main_data_begin pointer */
    MAD_ERROR_BADPART3LEN	   = 0x0236,	/* bad audio data length */
    MAD_ERROR_BADHUFFTABLE   = 0x0237,	/* bad Huffman table select */
    MAD_ERROR_BADHUFFDATA	   = 0x0238,	/* Huffman data overrun */
    MAD_ERROR_BADSTEREO	   = 0x0239	/* incompatible block_type for JS */
};

# define MAD_RECOVERABLE(error)	((error) & 0xff00)

struct mad_stream {
    unsigned char const *buffer;		/* input bitstream buffer */
    unsigned char const *bufend;		/* end of buffer */
    unsigned long skiplen;		/* bytes to skip before next frame */

    int sync;				/* stream sync found */
    unsigned long freerate;		/* free bitrate (fixed) */

    unsigned char const *this_frame;	/* start of current frame */
    unsigned char const *next_frame;	/* start of next frame */
    struct mad_bitptr ptr;		/* current processing bit pointer */

    struct mad_bitptr anc_ptr;		/* ancillary bits pointer */
    unsigned int anc_bitlen;		/* number of ancillary bits */

    unsigned char main_data[MAD_BUFFER_MDLEN];
    /* Layer III main_data() */
    unsigned int md_len;			/* bytes in main_data */

    int options;				/* decoding options (see below) */
    enum mad_error error;			/* error code (see above) */
};

enum {
    MAD_OPTION_IGNORECRC      = 0x0001,	/* ignore CRC errors */
    MAD_OPTION_HALFSAMPLERATE = 0x0002	/* generate PCM at 1/2 sample rate */
# if 0  /* not yet implemented */
                                MAD_OPTION_LEFTCHANNEL    = 0x0010,	/* decode left channel only */
                                MAD_OPTION_RIGHTCHANNEL   = 0x0020,	/* decode right channel only */
                                MAD_OPTION_SINGLECHANNEL  = 0x0030	/* combine channels */
# endif
};

void mad_stream_init(struct mad_stream *);
void mad_stream_finish(struct mad_stream *);

# define mad_stream_options(stream, opts)  \
    ((void) ((stream)->options = (opts)))

void mad_stream_buffer(struct mad_stream *,
                       unsigned char const *, unsigned long);
void mad_stream_skip(struct mad_stream *, unsigned long);

int mad_stream_sync(struct mad_stream *);

char const *mad_stream_errorstr(struct mad_stream const *);

# endif

/* Id: frame.h,v 1.20 2004/01/23 09:41:32 rob Exp */

# ifndef LIBMAD_FRAME_H
# define LIBMAD_FRAME_H


enum mad_layer {
    MAD_LAYER_I   = 1,			/* Layer I */
    MAD_LAYER_II  = 2,			/* Layer II */
    MAD_LAYER_III = 3			/* Layer III */
};

enum mad_mode {
    MAD_MODE_SINGLE_CHANNEL = 0,		/* single channel */
    MAD_MODE_DUAL_CHANNEL	  = 1,		/* dual channel */
    MAD_MODE_JOINT_STEREO	  = 2,		/* joint (MS/intensity) stereo */
    MAD_MODE_STEREO	  = 3		/* normal LR stereo */
};

enum mad_emphasis {
    MAD_EMPHASIS_NONE	  = 0,		/* no emphasis */
    MAD_EMPHASIS_50_15_US	  = 1,		/* 50/15 microseconds emphasis */
    MAD_EMPHASIS_CCITT_J_17 = 3,		/* CCITT J.17 emphasis */
    MAD_EMPHASIS_RESERVED   = 2		/* unknown emphasis */
};

struct mad_header {
    enum mad_layer layer;			/* audio layer (1, 2, or 3) */
    enum mad_mode mode;			/* channel mode (see above) */
    int mode_extension;			/* additional mode info */
    enum mad_emphasis emphasis;		/* de-emphasis to use (see above) */

    unsigned long bitrate;		/* stream bitrate (bps) */
    unsigned int samplerate;		/* sampling frequency (Hz) */

    unsigned short crc_check;		/* frame CRC accumulator */
    unsigned short crc_target;		/* final target CRC checksum */

    int flags;				/* flags (see below) */
    int private_bits;			/* private bits (see below) */

    mad_timer_t duration;			/* audio playing time of frame */
};

struct mad_frame {
    struct mad_header header;		/* MPEG audio header */

    int options;				/* decoding options (from stream) */

    mad_fixed_t sbsample[2][36][32];	/* synthesis subband filter samples */
    mad_fixed_t overlap[2][32][18];	/* Layer III block overlap data */

    mad_fixed_t xr_raw[576 * 2];
    mad_fixed_t tmp[576];
};

# define MAD_NCHANNELS(header)		((header)->mode ? 2 : 1)
# define MAD_NSBSAMPLES(header)  \
  ((header)->layer == MAD_LAYER_I ? 12 :  \
   (((header)->layer == MAD_LAYER_III &&  \
     ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36))

enum {
    MAD_FLAG_NPRIVATE_III	= 0x0007,	/* number of Layer III private bits */
    MAD_FLAG_INCOMPLETE	= 0x0008,	/* header but not data is decoded */

    MAD_FLAG_PROTECTION	= 0x0010,	/* frame has CRC protection */
    MAD_FLAG_COPYRIGHT	= 0x0020,	/* frame is copyright */
    MAD_FLAG_ORIGINAL	= 0x0040,	/* frame is original (else copy) */
    MAD_FLAG_PADDING	= 0x0080,	/* frame has additional slot */

    MAD_FLAG_I_STEREO	= 0x0100,	/* uses intensity joint stereo */
    MAD_FLAG_MS_STEREO	= 0x0200,	/* uses middle/side joint stereo */
    MAD_FLAG_FREEFORMAT	= 0x0400,	/* uses free format bitrate */

    MAD_FLAG_LSF_EXT	= 0x1000,	/* lower sampling freq. extension */
    MAD_FLAG_MC_EXT	= 0x2000,	/* multichannel audio extension */
    MAD_FLAG_MPEG_2_5_EXT	= 0x4000	/* MPEG 2.5 (unofficial) extension */
};

enum {
    MAD_PRIVATE_HEADER	= 0x0100,	/* header private bit */
    MAD_PRIVATE_III	= 0x001f	/* Layer III private bits (up to 5) */
};

void mad_header_init(struct mad_header *);

# define mad_header_finish(header)  /* nothing */

int mad_header_decode(struct mad_header *, struct mad_stream *);

void mad_frame_init(struct mad_frame *);
void mad_frame_finish(struct mad_frame *);

int mad_frame_decode(struct mad_frame *, struct mad_stream *);

void mad_frame_mute(struct mad_frame *);

# endif

/* Id: synth.h,v 1.15 2004/01/23 09:41:33 rob Exp */

# ifndef LIBMAD_SYNTH_H
# define LIBMAD_SYNTH_H


struct mad_pcm {
    unsigned int samplerate;		/* sampling frequency (Hz) */
    unsigned short channels;		/* number of channels */
    unsigned short length;		/* number of samples per channel */
    //  int16_t samples[2][1152];		/* PCM output samples [ch][sample] */
    int16_t samplesX[1152][2] __attribute__((aligned(4)));		/* PCM output samples [ch][sample] */
};

struct mad_synth {
    mad_fixed_t filter[2][2][2][16][8];	/* polyphase filterbank outputs */
    /* [ch][eo][peo][s][v] */

    unsigned int phase;			/* current processing phase */

    struct mad_pcm pcm;			/* PCM output */
};

/* single channel PCM selector */
enum {
    MAD_PCM_CHANNEL_SINGLE = 0
};

/* dual channel PCM selector */
enum {
    MAD_PCM_CHANNEL_DUAL_1 = 0,
    MAD_PCM_CHANNEL_DUAL_2 = 1
};

/* stereo PCM selector */
enum {
    MAD_PCM_CHANNEL_STEREO_LEFT  = 0,
    MAD_PCM_CHANNEL_STEREO_RIGHT = 1
};

void mad_synth_init(struct mad_synth *);

# define mad_synth_finish(synth)  /* nothing */


enum mad_flow {
    MAD_FLOW_CONTINUE = 0x0000,  /* continue normally */
    MAD_FLOW_STOP     = 0x0010, /* stop decoding normally */
    MAD_FLOW_BREAK    = 0x0011, /* stop decoding and signal an error */
    MAD_FLOW_IGNORE   = 0x0020  /* ignore the current frame */
};


void mad_synth_mute(struct mad_synth *);

void mad_synth_frame(struct mad_synth *, struct mad_frame const *);

# endif

# ifdef __cplusplus
}
# endif
